C:\Documents and Settings\Web Developer\Desktop\d360-rails\destination360.com>ge
m install yelp
Building native extensions.  This could take a while...
ERROR:  Error installing yelp:
        ERROR: Failed to build gem native extension.

c:/ruby/bin/ruby.exe extconf.rb install yelp
creating Makefile

nmake
'nmake' is not recognized as an internal or external command,
operable program or batch file.


Gem files will remain installed in c:/ruby/lib/ruby/gems/1.8/gems/json-1.1.3 for
 inspection.
Results logged to c:/ruby/lib/ruby/gems/1.8/gems/json-1.1.3/ext/json/ext/parser/
gem_make.out